dmesg Support

[Sascha Hauer]

Printing informations during startup is very useful, but due to slow serial
printouts it adds to the startup time of barebox. This series adds logbuffer
support and a 'dmesg' command, so it becomes possible to reduce the loglevel
while the messages are still available later. As a bonus the timestamp for
each message is recorded so that together with CONFIG_DEBUG_INITCALLS detailed
timing information of the startup process can be collected.
The dmesg support nearly compiles away when it's disabled.

Sascha

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Sascha Hauer (4):
      clock: Add a variable with the first timestamp after startup
      clock: make get_time_ns() safe to be called without clocksource
      startup: Don't print multiple lines with pr_info
      Introduce message logging support

 commands/Kconfig        |   7 +++
 commands/Makefile       |   1 +
 commands/dmesg.c        | 100 +++++++++++++++++++++++++++++++++++++
 common/Kconfig          |   3 ++
 common/clock.c          |  11 +++++
 common/console_common.c | 129 ++++++++++++++++++++++++++++++++++++++++++++++--
 common/version.c        |   4 +-
 drivers/base/driver.c   |  22 ---------
 include/clock.h         |   2 +
 include/printk.h        |  17 +++++++
 10 files changed, 270 insertions(+), 26 deletions(-)
 create mode 100644 commands/dmesg.c